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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61bcf5108eeb2f3dcaa1ab954ecb2060ec17f25db3403fb6731f1aeb05cc5901' 
  AND token = 'q9PbIuJQZGGjp+IhKm3dAk1WgeCQ8Yrlk4OxjT0h48w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}